430 



ELECTRICAL EQUIPMENT 



and the tubes (Fig. 270). All the joints are welded and oil-tight. 

 For the very largest sizes, where the tank with attached radiator 

 tubes becomes too large for transportation, a design shown in 



FIG. 269. Self-cooled Transformer with Corrugated Tank. Outdoor Type. 



Fig. 271 has been used. It consists of separate radiator sections 

 of welded, fluted steel, which may be detached during trans- 

 portation. 



